@article{AIHPC_1989__6_6_419_0,
     author = {Crandall, Michael G.},
     title = {Semidifferentials, quadratic forms and fully nonlinear elliptic equations of second order},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {419--435},
     publisher = {Gauthier-Villars},
     volume = {6},
     number = {6},
     year = {1989},
     mrnumber = {1035337},
     zbl = {0734.35033},
     language = {en},
     url = {http://www.numdam.org/item/AIHPC_1989__6_6_419_0/}
}